Worf

Worf is an influential 24th century Klingon Starfleet officer. After the death of Lt. Yar, he served as Security Chief aboard the USS Enterprise-D until its destruction. Then he served at the Deep Space Nine.
The presence of Worf in Star Trek Timelines was first revealed in the PAX East 2015 Demo. Worf is a tactical specialist, and can inflict heavy damage when used in ship battles [1]